5. Functions
5.1. Functions included in AQ-E215
The AQ-E215 energy management protection IED includes the following functions as well as the
number of stages for those functions. The mentioned fault indicating functions are accessible through
the
Fault monitor
tab in the
Monitoring
menu.
Table. 5.1. - 1. Fault indicating functions of AQ-E215.
Name (number of stages)
IEC
ANSI
Description
NOC (1)
I>
50
Non-directional overcurrent
NEF (1)
I0>
50N
Non-directional earth fault
DOC (1)
Idir>
67
Directional overcurrent
DEF (1)
I0dir>
67N
Directional earth fault
UV (1)
U<
27
Undervoltage
NOV (1)
U0>
59N
Neutral overvoltage
IEF (1)
I0int>
67NT
Intermittent earth fault
Table. 5.1. - 2. Control functions of AQ-E215.
Name
IEC
ANSI
Description
SGS
-
-
Setting group selection
Table. 5.1. - 3. Monitoring functions of AQ-E215.
Name
IEC
ANSI
Description
CTS
-
-
Current transformer supervision
VTS
-
60
Voltage transformer supervision
DR
-
-
Disturbance recorder
THD
-
-
Total harmonic distortion
FLX
-
21FL
Fault locator
VREC
-
-
Measurement value recorder
5.2. Measurements
5.2.1. Current measurement and scaling
The current measurement module (CT module, or CTM) is used for measuring the currents from
current transformers. The measured values are processed into the measurement database and they
are used by measurement and protection functions. It is essential to understand the concept of current
measurements to be able to get correct measurements.
AQ-E215
Instruction manual
Version: 2.01
© Arcteq Relays Ltd
32